Subject: Re: [xsl] position last and attributes From: Wolfgang Laun <wolfgang.laun@xxxxxxxxx> Date: Thu, 20 Sep 2012 14:24:02 +0200 |
On 20/09/2012, Ihe Onwuka <ihe.onwuka@xxxxxxxxxxxxxx> wrote: > On Thu, Sep 20, 2012 at 12:30 PM, Andrew Welch <andrew.j.welch@xxxxxxxxx> > wrote: >>> <A 1st="1" second="2" third="3" fourth="4" fifth="5"/> >>> >>> now tell me what are the first and last attributes of A. >> >> Ok, but first (as hopefully this will explain it): >> >> 1. What is the position() of @third ? >> >> 2. Why do: >> >> @second/position() >> >> @third/position() >> >> both return 1? >> > > No. I'm moving on from the orthogonal conversation to one that is > conducted on my terms since you are the one trying to understand me. > > <A 1st="1" second="2" third="3" fourth="4" fifth="5"/> > > 1. what are the first and last attributes of A. > 2. what are A/@*[1] and A/@*[last()] > > Is there a definitive answer to 1 (I say no). Correct, because the question does not make sense: you are asking about non-existing properties of a *set*. > Are there definitive answers to 2 (Well a processor will always give > you one if the set is not empty). No - we know that this is implementation dependent. > > Is A/@* a representation of the attributes of A. (I say yes). It has the same cardinality. All values of this representation are contained in the other representation. There is a bijection between these two. > Is A/@* a faithful representation of the attributes of A? No: it has lost the set-ness. > > If A/@* is a faithful representation of the attributes of A why does > it yields answers to questions that the original representation can't > answer. Because the transformation has added new properties. You might add the colours of the rainbow, too, and it will answer questions such as "Which is red?" > > So what if A/@* is not a faithful representation. Should I present the > answers it gives me as a universal truth. No, it's the truth about the transformation process from one to the other. -W
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